arch/x86: Use defines for GDT segments

Stop using magic values and use defines for Global Descriptor Table
(GDT) offsets. Use the existing defines from the corresponding headers.

Change-Id: I40c15f6341bdef9cd457619ec81e7ac624ec2d63
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87254
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/x86/wakeup.S

@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <arch/ram_segs.h>
+
 #define WAKEUP_BASE		0x600
 #define RELOCATED(x)	(x - __wakeup + WAKEUP_BASE)
 
@@ -29,7 +31,7 @@ __wakeup:
 	add	$8, %rax
 	push	%rax
 	pushfq
-	push	$0x10
+	push	$RAM_CODE_SEG
 	lea	3(%rip), %rax
 	push	%rax
 	iretq
@@ -58,7 +60,7 @@ __wakeup:
 	movw	%ax, (__wakeup_segment)
 
 	/* Activate the right segment descriptor real mode. */
-	ljmp	$0x28, $RELOCATED(1f)
+	ljmp	$RAM_CODE16_SEG, $RELOCATED(1f)
 1:
 .code16
 	/* 16 bit code from here on... */
@@ -68,7 +70,7 @@ __wakeup:
 	 * configurations (limits, writability, etc.) once
 	 * protected mode is turned off.
 	 */
-	mov	$0x30, %ax
+	mov	$RAM_DATA16_SEG, %ax
 	mov	%ax, %ds
 	mov	%ax, %es
 	mov	%ax, %fs

src/cpu/x86/smm/smm_stub.S

@@ -9,6 +9,7 @@
  * found in smm.h.
  */
 
+#include <arch/rom_segs.h>
 #include <cpu/x86/cr.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/lapic_def.h>
@@ -93,7 +94,7 @@ untampered_lapic:
 	movl	%eax, %cr0
 
 	/* Enable protected mode */
-	ljmpl	$0x8, $smm_trampoline32
+	ljmpl	$ROM_CODE_SEG, $smm_trampoline32
 
 .align 4
 smm_relocate_gdt:
@@ -124,7 +125,7 @@ smm_relocate_gdt_end:
 .global smm_trampoline32
 smm_trampoline32:
 	/* Use flat data segment */
-	movw	$0x10, %ax
+	movw	$ROM_DATA_SEG, %ax
 	movw	%ax, %ds
 	movw	%ax, %es
 	movw	%ax, %ss

src/device/oprom/realmode/x86_asm.S

@@ -150,7 +150,7 @@ __realmode_call:
 	mov	%ax, %es
 	mov	%ax, %fs
 	mov	%ax, %gs
-	mov	$0x40, %ax
+	mov	$RAM_DATA_ACPI_SEG, %ax
 	mov	%ax, %ds
 	pop	%ax